There is an L1335+ category at the R-L21 Plus Project. There you can see a list of quite a few of those who have tested L1335+. Most of them belong to the Scots Modal Cluster, but there is a Welsh cluster that has tested L1335+, too.

The L1335** guy are really closely related ie at around 518 ybp modal which is not a good picture. I have to combine them with the rest of the Scots to get a true age. So everyone needs to test for both SNPs. Noting the ages mentioned below the maybe only about three GD difference. Mark